CN101280114B - SBS modified road asphalt, production method and device thereof - Google Patents
SBS modified road asphalt, production method and device thereof Download PDFInfo
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- CN101280114B CN101280114B CN2008100374555A CN200810037455A CN101280114B CN 101280114 B CN101280114 B CN 101280114B CN 2008100374555 A CN2008100374555 A CN 2008100374555A CN 200810037455 A CN200810037455 A CN 200810037455A CN 101280114 B CN101280114 B CN 101280114B
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Abstract
The invention belongs to the technical field of pavement materials and particularly relating to an SBS modified road asphalt and the production method and device. The modified road asphalt has the following components of raw materials by weight proportion: 89-97 portions of matrix asphalt, 2-6 portions of modifier SBS, 3-10 portions of rubber oil, and 0.1-0.5 portion of stabilizer. Through secondary high-shear, the SBS is reacted with the road asphalt as fine particles or evenly and stably dispersed in the road asphalt to avoid stratification, cohesion or isolation. By controlling the temperature of each node, the invention prevents the aging of the asphalt and ensures the quality stability of the modified asphalt. The invention has made improvements based on ordinary modified asphalt production equipment to achieve large-scale production. The SBS modified asphalt product has stable quality and can meet or exceed related national standards.
Description
Technical field
The invention belongs to the ground surface material technical field, be specifically related to SBS modifying asphalt and production method and the device used on a kind of traffic route road surface.
Background technology
Along with the Chinese national economy high speed development, traffic volume of highway increases rapidly, and Road transport is busy day by day.Although many asphalt highways have used satisfactory heavy duty road asphalt or Imported Asphalt, still can not satisfy the demand.Diseases such as the rut of bituminous pavement, cracking, hole groove are very serious.For improve the performance of bituminous pavement comprehensively, adopting modifying asphalt is one of effective measures.The highway design specifications and the asphalt pavement construction standard of new revision all explicitly call for the all-round popularization modifying asphalt, the going up of asphalt pavement of highway, in the two-layer modifying asphalt that substantially all uses.At present, use the more modifying asphalts such as SBR, PE, EVA, rubber powder, SBS that mainly contain, and SBS is because its good two-way modification performance (promptly changing the high temperature of matrix pitch and the ability of low-temperature performance simultaneously) obtains using the most widely in recent years.
The SBS modifying asphalt is to prepare as properties-correcting agent with styrene-butadiene-styrene block copolymer (being SBS), by the physical blending process, aromatic hydrocarbons in the SBS adsorptive pitch and colloid, the swelling phenomenon takes place, form new colloidal structure system, promptly in pitch, form network structure, the bituminous performance is improved comprehensively.
China starts to walk early about the research work of modifying asphalt, and Chinese patent ZL02132729.7 discloses a kind of elder generation and made the homogeneous phase body with SBS and two refining furfural extract oils, mixes the method for making modifying asphalt with bitumen for road use again.Though this method has solved the scattering problem of SBS, the modifying asphalt index of making only is fit to the service requirements of China some areas.
Chinese patent application 03113237.5 discloses a kind of employing styrene-ethylene-butylene-styrene segmented copolymer (SEBS) and pitch under 160 ℃-180 ℃ situation, made modifying asphalt in high speed shear 30-50 minute, this method adopts the production of existing SBS modified asphalt device, is difficult to guarantee the stable of performance of modified bitumen.
Chinese patent application 03141804.X discloses a kind of employing star shaped SBS and linear SBS composition as properties-correcting agent, mixes obtaining modifying asphalt with pitch by high speed shear and stirring, and this method only is breadboard result.
Along with the requirement of road engineering is more and more higher, requirement to road bitumen is also more and more higher, the method and apparatus of producing modifying asphalt is also more and more, but because pitch is the extremely complicated organic high molecular compound of a kind of composition, its component of pitch that adopts the different crude oils refining to form obviously is different, even if with a kind of crude oil, because of the different gained bituminous component ratios of refining process also are not quite similar.So, can produce the production technique and the production equipment of the very high modifying asphalt of steady quality and standard with a covering device, do not appear in the newspapers.
Summary of the invention
An object of the present invention is to provide a kind of modifying asphalt of excellent property, the properties-correcting agent that wherein is used for modification is styrene-butadiene-styrene block copolymer (being SBS).
Another object of the present invention provides a kind of production method and device of environmental protection and energy saving, makes the steady quality of SBS modifying asphalt and meets or exceeds relevant national standard.
Modifying asphalt provided by the invention, adopt the secondary high shear process, make properties-correcting agent SBS with fine particle and matrix pitch reacts or evenly, stably be dispersed in the matrix pitch and prepare, its feed composition proportioning is as follows: (i) matrix pitch 89-97 weight part; (ii) properties-correcting agent SBS2-6 weight part; (iii) additive rubber oil 3-10 weight part; (iv) stablizer 0.1-0.5 weight part;
Wherein, among the properties-correcting agent SBS, the ratio of vinylbenzene and butadiene block is 30/70, and molecular weight is 10-20 ten thousand; Additive rubber oil, its 100 ℃ of kinematic viscosity are 10-35mm
2/ s; Matrix pitch can adopt the road bitumen of label 70#, 90# or 100#; Stablizer is that commercially available road bitumen is stabilizing agent specially used.
The present invention also provides the production method of above-mentioned modifying asphalt, makes the waste gas that produces in the production process all be recovered to boiler combustion, and rationally utilizes the exchange of heat energy, reaches the effect of environmental protection and energy saving.Concrete steps are as follows:
With temperature is 120 ℃-130 ℃ matrix pitch, and the modifying asphalt with 170 ℃-180 ℃ of temperature in low-temperature heater is heated to 130 ℃-150 ℃, again in high temperature heater (HTH), with heat-conducting oil heating to 170 ℃-190 ℃, sends into material-compound tank then; In material-compound tank with the properties-correcting agent SBS and the rubber oil that add, disperse, stirred 30-80 minute, shear through the single-stage high-shear emulsion machine again, enter swelling can then, in swelling can, disperse, stirred 30-80 minute, shear through multistage high-shear emulsion machine again with the stablizer that adds, in low-temperature heater, carry out heat exchange again with matrix pitch, temperature is reduced to below 160 ℃, grows 1-3 hour in the modifying asphalt hold-up vessel at last, promptly makes modifying asphalt.
The present invention also provides the production equipment of above-mentioned modifying asphalt, takes into full account the susceptibility of road bitumen to temperature, controls the temperature of each node by strictness, and it is aging to prevent that pitch from taking place in production process, reaches the purpose of stablizing SBS modifying asphalt quality.This device unloads oil groove 1,7 bitumenpumps 2,4,8,11,14,17,19, matrix pitch hold-up vessel 3, low-temperature heater 5, high temperature heater (HTH) 6, material-compound tank 7, single-stage high-shear emulsion machine 9, swelling can 10, multistage high-shear emulsion machine 12, modifying asphalt hold-up vessel 13, loading platform 15, rubber oil unloads oil groove 16, rubber oil hold-up vessel 18, and SBS weighs, delivery system 20, stablizer is weighed, delivery system 21, heat conducting oil boiler 22 is formed through pipe connection, wherein, unloads oil groove 1, matrix pitch hold-up vessel 3, low-temperature heater 5, high temperature heater (HTH) 6, modifying asphalt hold-up vessel 13, loading platform 15, rubber oil unloads oil groove 16 and all has heating, attemperator; Material-compound tank 7, swelling can 10, modifying asphalt hold-up vessel 13 all have insulation, dispersion, whipping appts.Unload oil groove 1,2# equipment bitumenpump 2, matrix pitch hold-up vessel 3,4# equipment bitumenpump 4, low-temperature heater 5, high temperature heater (HTH) 6, material-compound tank 7,19# equipment bitumenpump 19, rubber oil hold-up vessel 18,17# equipment bitumenpump 17, rubber oil unloads oil groove 16 and connects successively; Material-compound tank 7 also is connected with 8# equipment bitumenpump 8, single-stage high-shear emulsion machine 9, swelling can 10,11# equipment bitumenpump 11, multistage high-shear emulsion machine 12, low-temperature heater 5 successively; Material-compound tank 7 is also weighed with SBS, delivery system 20 is connected; Swelling can 10 is also weighed with stablizer, delivery system 21 is connected; Low-temperature heater 5 also is connected with modifying asphalt hold-up vessel 13,14# equipment bitumenpump 14, loading platform 15.
Environmental protection and energy saving production technique provided by the invention (device) is taked the method for secondary high-shear, makes SBS with fine particle and road bitumen reacts or evenly, stably be dispersed in the road bitumen, and layering does not take place, phenomenon such as cohesion or segregation.
Environmental protection and energy saving production method provided by the invention based on common modifying asphalt production unit, has realized batch production production, and can satisfy the production requirement of various scales.
Description of drawings
Fig. 1 illustrates for the technological process of production of the present invention.
Fig. 2 is for apparatus of the present invention structure and flow to the plane diagram.
Number in the figure: 1 unloads oil groove for 1# equipment, 16 unload oil groove for 2# equipment, 2,4,8,11,14,17,19 be followed successively by 2#, 4#, 8#, 11#, 14#, 17#, 19# equipment bitumenpump, 3 is the matrix pitch hold-up vessel, 18 is rubber oil hold-up vessel, 5 is low-temperature heater, and 6 is high temperature heater (HTH), and 7 is material-compound tank, 9 is the single-stage high-shear emulsion machine, 10 is swelling can, and 12 is multistage high-shear emulsion machine, and 13 is the modifying asphalt hold-up vessel, 15 is loading platform, 20 for SBS weighs and delivery system, and 21 are the stablizer delivery system of weighing, and 22 is heat conducting oil boiler.
Embodiment
Modified asphalt production device provided by the invention, being described below of its support equipment:
1.1
#With 16
#Equipment unloads oil groove 1 and 16, is the steel cylindrical container, and built-in heat-conducting oil heating coil pipe adds lagging material, volume 50m
3About.Major function is earlier the material in the conveying trough tank car to be discharged in the groove, and then is sent in the relevant storage tank by bitumenpump.
2.2
#, 4
#, 8
#, 11
#, 14
#, 17
#With 19
# Equipment bitumenpump 2,4,8,11,14,17,19 is commercial screw rod or gear bitumenpump.Major function is a convey materials.
3.3
#With 18
#Equipment matrix pitch hold-up vessel 3 and rubber oil hold-up vessel 18 are the steel cylindrical container, and built-in heat-conducting oil heating coil pipe adds lagging material, volume 100-500m
3About.Major function is to store matrix pitch and stablizer.
4.5
#Equipment low-temperature heater 5 is the steel cylindrical container, and the hot tubulation of built-in steel is walked the modifying asphalt tubulation and walked matrix pitch outward in the tubulation, add lagging material, volume 30m
3About.Major function is to utilize 170 ℃-180 ℃ modifying asphalt, heats 120 ℃ of-130 ℃ of matrix pitches, makes the temperature of matrix pitch reach 130 ℃-150 ℃.
5.6
#Equipment high temperature heater (HTH) 6 is the steel cylindrical container, and built-in steel heat-conducting oil heating tubulation is walked thermal oil in the tubulation, and tubulation is walked matrix pitch outward, adds lagging material, volume 30m
3About.Major function is to utilize the pyritous thermal oil that matrix pitch is heated to 170 ℃-190 ℃.
6.7
#Equipment material-compound tank 7 is the steel cylindrical container, and two in built-in distributing agitator adds lagging material, volume 20m
3About.Major function is by processing requirement, in required material is added jar, and under the effect of distributing agitator uniform mixing.
7.9
#Equipment single-stage high-shear emulsion machine 9 is commercial single-stage high-shear emulsion machine, about power 75KW.Major function is that the material in the material-compound tank is tentatively sheared, and material is further mixed, and reaches certain fineness.
8.10
#Equipment swelling can 10 is the steel cylindrical container, and two in built-in distributing agitator adds lagging material, volume 20m
3About.Major function is with the material that makes through preliminary shearing, further mixes with the stablizer that adds, and under the effect of distributing agitator, reaches thorough mixing, swelling.
9.12
#The multistage high-shear emulsion machine 12 of equipment is commercial multistage high-shear emulsion machine, about power 135KW.Major function is with the material in the swelling can, under the multistage shearing of this equipment, reaches the fineness of processing requirement.
10.13
#Equipment modifying asphalt hold-up vessel 13: be the steel cylindrical container, built-in heat-conducting oil heating coil pipe is installed agitator in jar, add lagging material, volume 100-500m
3Left and right sides major function is to store modifying asphalt.
11.15
#Equipment loading platform 15: the oil filling riser formula loading apparatus that generally adopts for petroleum chemical industry.Major function is that modifying asphalt is packed in the conveying trough tank car.
12.20
#The equipment SBS delivery system 20 of weighing: be the system that forms by hopper, weighing device, Pneumatic conveyer and pipeline, the 0-1000 kilogram of weighing, transport capacity 0-5 ton/hour.Major function is the proportioning by processing requirement, and SBS is added in the material-compound tank.
13.21
#The equipment stablizer delivery system 21 of weighing: be the system that forms by hopper, weighing device, Pneumatic conveyer and pipeline, the 0-100 kilogram of weighing, transport capacity 0-1 ton/hour.Major function is the proportioning by processing requirement, and stablizer is added in the swelling can.
14.22
#Equipment heat conducting oil boiler 22: in commercial heat conduction oil cauldron, power 125KW. major function is the heating matrix pitch, heats the heating of all kinds of storage tanks and pipeline simultaneously.
Utilization aforesaid device carries out the production method of modifying asphalt, and concrete steps are as follows: temperature is 120 ℃-130 ℃ a matrix pitch, 5
#In the equipment low-temperature heater, be that 170 ℃-180 ℃ modifying asphalt is heated to 130 ℃-150 ℃ with temperature, then 6
#In the equipment high temperature heater (HTH),, enter 7 with heat-conducting oil heating to 170 ℃-190 ℃
#The equipment material-compound tank; 7
#With the SBS and the rubber oil that add, process is disperseed, was stirred 30-80 minute in the equipment material-compound tank; Again through 12
#Equipment single-stage high-shear emulsion machine is sheared, and enters 10 again
#The equipment swelling can is 10
#Disperse, stirred 30-80 minute, with the stablizer process that adds in the equipment swelling can again through 12
#The multistage high-shear emulsion machine of equipment is sheared, then 5
#Be that 120 ℃-130 ℃ matrix pitch carries out heat exchange with temperature in the equipment low-temperature heater, temperature is reduced to below 160 ℃, 13
#Grew 1-3 hour in the equipment modifying asphalt hold-up vessel, promptly make required modifying asphalt.
The matrix pitch that the present invention adopts is that label is 70
#, 90
#Or 100
#Road bitumen, can select for use according to specific requirement.
Used properties-correcting agent is linear SBS, and vinylbenzene and butadiene block be than 30/70, molecular weight 10-20 ten thousand.
Used rubber oil is rubber aromatic oil, 100 ℃ of kinematic viscosity 10-35mm
2/ S.
It is stabilizing agent specially used that used stablizer is that modifying asphalt is buied in market.
Environmental protection and energy saving production method provided by the invention and device, the preparation modifying asphalt production method as shown in Figure 1: from the matrix pitch of groove tank car, temperature is discharged into 1 for 120 ℃-130 ℃
#Equipment unloads oil groove, by 2
#The equipment bitumenpump squeezes into 3
#Equipment matrix pitch storage tank keeps 120 ℃-130 ℃ of temperature, again by 4
#The equipment bitumenpump is extracted out, through entering 5
#The equipment low-temperature heater is and from 12
#The modifying asphalt of the multistage high-shear emulsion machine of equipment carries out heat exchange, and temperature rises to 130 ℃-150 ℃ and enters 6
#The equipment high temperature heater (HTH) is 6
#In the equipment high temperature heater (HTH), quilt is from 22
#The heat-conducting oil heating of equipment heat conducting oil boiler, temperature rise to 170 ℃-190 ℃, enter 7
#The equipment material-compound tank is in jar and from 20
#The weigh SBS of delivery system and of equipment from 19
#The rubber oil of equipment bitumenpump disperses, stirs, and is controlled at about temperature about 180 ℃, after about 30-80 minute, via 8
#Equipment bitumenpump, 9
#Equipment single-stage mulser squeezes into 10
#The equipment swelling can is and from 20
#The weigh stablizer of delivery system of equipment is through disperseing, stirring 30-80 minute, again via 11
#Equipment bitumenpump, 12
#The multistage high-shear emulsion machine of equipment enters 5
#The equipment low-temperature heater, carry out heat exchange with matrix pitch after, temperature is reduced to below 160 ℃, enters 13
#Equipment modifying asphalt storage tank is 13
#Grew 1-3 hour in the equipment modifying asphalt hold-up vessel, make required modifying asphalt.At last, by 14
#The equipment bitumenpump is by 15
#The equipment loading platform adds the transportation of groove tank car, or directly by 14
#The equipment bitumenpump, near the bituminous concrete batching plant delivering to.
In addition, from the rubber oil of groove tank car, temperature is discharged into 16 for 140 ℃-160 ℃
#Equipment unloads oil groove, by 17
#The equipment bitumenpump squeezes into 18
#Equipment rubber oil tank is again by 19
#The equipment bitumenpump joins 7
#In the equipment material-compound tank.
7
#Equipment material-compound tank, 10
#The waste gas of discharging in the equipment swelling can is sent into boiler combustion by air extractor.
The plot plan of environmental protection and energy saving production technique provided by the invention (device) is shown in accompanying drawing (2).
The production technique (device) of SBS modified pavement asphalt of the present invention and environment-friendly and energy-efficient thereof is not limited to the foregoing description.
The modifying asphalt index is as follows:
Claims (3)
1. SBS modified pavement asphalt, it is characterized in that adopting the secondary high shear process, make properties-correcting agent SBS with fine particle and matrix pitch reacts or evenly, stably be dispersed in the matrix pitch and prepare, its feed composition proportioning is as follows: (i) matrix pitch 89-97 weight part; (ii) properties-correcting agent SBS2-6 weight part; (iii) additive rubber oil 3-10 weight part; (iv) stablizer 0.1-0.5 weight part;
Wherein, among the properties-correcting agent SBS, the ratio of vinylbenzene and butadiene block is 30/70, and molecular weight is 10-20 ten thousand; Additive rubber oil, its 100 ℃ of kinematic viscosity are 10-35mm
2/ s; Matrix pitch adopts the road bitumen of label 70#, 90# or 100#; Stablizer is that commercially available road bitumen is stabilizing agent specially used.
2. the production method of a SBS modified pavement asphalt as claimed in claim 1, it is characterized in that concrete steps are as follows: the matrix pitch that with temperature is 120 ℃-130 ℃, modifying asphalt with 170 ℃-180 ℃ of temperature in low-temperature heater is heated to 130 ℃-150 ℃ by heat exchange, again in high temperature heater (HTH), with heat-conducting oil heating to 170 ℃-190 ℃, send into material-compound tank then; In material-compound tank with the properties-correcting agent SBS and the rubber oil that add, disperse, stirred 30-80 minute, shear through the single-stage high-shear emulsion machine again, enter swelling can then, in swelling can, disperse, stirred 30-80 minute, shear through multistage high-shear emulsion machine again with the stablizer that adds, in low-temperature heater, carry out heat exchange again with matrix pitch, temperature is reduced to below 160 ℃, grows 1-3 hour in the modifying asphalt hold-up vessel at last, promptly makes modifying asphalt.
3. the production equipment of a SBS modified pavement asphalt as claimed in claim 1, it is characterized in that by unloading oil groove (1), 7 bitumenpumps (2,4,8,11,14,17,19), matrix pitch hold-up vessel (3), low-temperature heater (5), high temperature heater (HTH) (6), material-compound tank (7), single-stage high-shear emulsion machine (9), swelling can (10), multistage high-shear emulsion machine (12), modifying asphalt hold-up vessel (13), loading platform (15), rubber oil unload oil groove (16), rubber oil hold-up vessel (18), SBS weighs, delivery system (20), stablizer is weighed, delivery system (21), heat conducting oil boiler (22) is formed through pipe connection, wherein, unload oil groove (1), matrix pitch hold-up vessel (3), low-temperature heater (5), high temperature heater (HTH) (6), modifying asphalt hold-up vessel (13), loading platform (15), rubber oil unloads oil groove (16) and all has heating, attemperator; Material-compound tank (7), swelling can (10), modifying asphalt hold-up vessel (13) all have insulation, dispersion, whipping appts; Unload oil groove (1), 2# equipment bitumenpump (2), matrix pitch hold-up vessel (3), 4# equipment bitumenpump (4), low-temperature heater (5), high temperature heater (HTH) (6), material-compound tank (7), 19# equipment bitumenpump (19), rubber oil hold-up vessel (18), 17# equipment bitumenpump (17), rubber oil unloads oil groove (16) and connects successively; Material-compound tank (7) also is connected with 8# equipment bitumenpump (8), single-stage high-shear emulsion machine (9), swelling can (10), 11# equipment bitumenpump (11), multistage high-shear emulsion machine (12), low-temperature heater (5) successively; Material-compound tank (7) is also weighed with SBS, delivery system (20) is connected; Swelling can (10) is also weighed with stablizer, delivery system (21) is connected; Low-temperature heater (5) also is connected with modifying asphalt hold-up vessel (13), 14# equipment bitumenpump (14), loading platform (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100374555A CN101280114B (en) | 2008-05-15 | 2008-05-15 | SBS modified road asphalt, production method and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100374555A CN101280114B (en) | 2008-05-15 | 2008-05-15 | SBS modified road asphalt, production method and device thereof |
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| CN101280114A CN101280114A (en) | 2008-10-08 |
| CN101280114B true CN101280114B (en) | 2011-05-11 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962482B (en) * | 2010-10-26 | 2012-05-16 | 徐州市路兴公路工程有限公司 | SBS (Styrene-Butadiene-Styrene) modified asphalt and production method thereof |
| CN102444074B (en) * | 2011-10-24 | 2014-03-12 | 周其强 | Device for producing modified asphalt and method for producing modified asphalt by using device |
| CN102979029A (en) * | 2012-12-04 | 2013-03-20 | 北京嘉格伟业筑路科技有限公司 | Intensive production, transportation and supply method of rubber asphalt |
| CN103396670B (en) * | 2013-07-11 | 2016-03-23 | 河海大学 | A kind of water-repellent modified pitch for dam asphalt well and preparation method thereof |
| CN104560087A (en) * | 2015-01-21 | 2015-04-29 | 中化弘润石油化工有限公司 | Modified asphalt production system |
| CN105289445B (en) * | 2015-11-06 | 2017-11-17 | 天津海泰环保科技发展股份有限公司 | The environment-friendly type of rubber powder modified asphalt prepares experiment porch and experimental method |
| CN109517396A (en) * | 2018-12-04 | 2019-03-26 | 黄河三角洲京博化工研究院有限公司 | A kind of modified pitch and preparation method thereof |
| CN110511578A (en) * | 2018-12-25 | 2019-11-29 | 泰州汇聚科技服务有限公司 | A kind of modified pavement asphalt production technology |
| CN110585979B (en) * | 2019-09-11 | 2021-10-15 | 中南林业科技大学 | Energy-conserving production facility of emulsified asphalt |
| CN110747715B (en) * | 2019-11-06 | 2021-10-15 | 重庆鑫路捷科技有限公司 | Energy-saving environment-friendly modified asphalt device and modified asphalt production method |
| CN114015250A (en) * | 2021-11-22 | 2022-02-08 | 河北雄安京德高速公路有限公司 | Rubber modified asphalt for long-life pavement, and preparation method, preparation equipment and application thereof |
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| CN1414038A (en) * | 2002-08-02 | 2003-04-30 | 大连市政设施管修处 | Modified asphalt and its preparation method |
| CN1448440A (en) * | 2003-04-21 | 2003-10-15 | 东南大学 | Modified road asphalt and its prep. |
| CN1569964A (en) * | 2003-07-24 | 2005-01-26 | 上海群康沥青科技有限公司 | High performance SBS modified asphalt and its making method |
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| US5342866A (en) * | 1992-12-30 | 1994-08-30 | Owens-Corning Fiberglas Technology Inc. | Oxidized asphalt rubber system |
| CN1414038A (en) * | 2002-08-02 | 2003-04-30 | 大连市政设施管修处 | Modified asphalt and its preparation method |
| CN1448440A (en) * | 2003-04-21 | 2003-10-15 | 东南大学 | Modified road asphalt and its prep. |
| CN1569964A (en) * | 2003-07-24 | 2005-01-26 | 上海群康沥青科技有限公司 | High performance SBS modified asphalt and its making method |
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